I was gonna say SCT and FL2K and events like that are probably what you're going to race in if heads up is what you're looking for. Don't see many Challengers at those, at least what I've watched which admittedly isn't much. Lots of carnage at those events, no wonder people watch it. Joe Public loves the drama
We'll see what 2024 brings. Last year is a blur but I don't remember seeing many Challenger/Chargers running 9s. Most compete in 10.00 classes that I've seen anyway which is a good happy spot for them IMO. Much below that and engine upgrades become a necessity IMO.